2 * intel TCO vendor specific watchdog driver support
4 * (c) Copyright 2006-2008 Wim Van Sebroeck <wim@iguana.be>.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
11 * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
12 * provide warranty for any of this software. This material is
13 * provided "AS-IS" and at no charge.
17 * Includes, defines, variables, module parameters, ...
20 /* Module and version information */
21 #define DRV_NAME "iTCO_vendor_support"
22 #define DRV_VERSION "1.02"
23 #define PFX DRV_NAME ": "
26 #include <linux/module.h> /* For module specific items */
27 #include <linux/moduleparam.h> /* For new moduleparam's */
28 #include <linux/types.h> /* For standard types (like size_t) */
29 #include <linux/errno.h> /* For the -ENODEV/... values */
30 #include <linux/kernel.h> /* For printk/panic/... */
31 #include <linux/init.h> /* For __init/__exit/... */
32 #include <linux/ioport.h> /* For io-port access */
33 #include <linux/io.h> /* For inb/outb/... */
35 #include "iTCO_vendor.h"
38 #define SMI_EN acpibase + 0x30 /* SMI Control and Enable Register */
39 #define TCOBASE acpibase + 0x60 /* TCO base address */
40 #define TCO1_STS TCOBASE + 0x04 /* TCO1 Status Register */
42 /* List of vendor support modes */
43 /* SuperMicro Pentium 3 Era 370SSE+-OEM1/P3TSSE */
44 #define SUPERMICRO_OLD_BOARD 1
45 /* SuperMicro Pentium 4 / Xeon 4 / EMT64T Era Systems */
46 #define SUPERMICRO_NEW_BOARD 2
48 static int vendorsupport;
49 module_param(vendorsupport, int, 0);
50 MODULE_PARM_DESC(vendorsupport, "iTCO vendor specific support mode, default=0 (none), 1=SuperMicro Pent3, 2=SuperMicro Pent4+");
53 * Vendor Specific Support
58 * Board: Super Micro Computer Inc. 370SSE+-OEM1/P3TSSE
61 * Code contributed by: R. Seretny <lkpatches@paypc.com>
62 * Documentation obtained by R. Seretny from SuperMicro Technical Support
64 * To enable Watchdog function:
65 * BIOS setup -> Power -> TCO Logic SMI Enable -> Within5Minutes
66 * This setting enables SMI to clear the watchdog expired flag.
67 * If BIOS or CPU fail which may cause SMI hang, then system will
68 * reboot. When application starts to use watchdog function,
69 * application has to take over the control from SMI.
71 * For P3TSSE, J36 jumper needs to be removed to enable the Watchdog
74 * Note: The system will reboot when Expire Flag is set TWICE.
75 * So, if the watchdog timer is 20 seconds, then the maximum hang
76 * time is about 40 seconds, and the minimum hang time is about
80 static void supermicro_old_pre_keepalive(unsigned long acpibase)
82 /* Reload TCO Timer (done in iTCO_wdt_keepalive) + */
83 /* Clear "Expire Flag" (Bit 3 of TC01_STS register) */
89 * Board: Super Micro Computer Inc. P4SBx, P4DPx
92 * Code contributed by: R. Seretny <lkpatches@paypc.com>
93 * Documentation obtained by R. Seretny from SuperMicro Technical Support
95 * To enable Watchdog function:
98 * BIOS setup -> Advanced -> Integrated Peripherals -> Watch Dog Feature
100 * BIOS setup -> Advanced -> I/O Device Configuration -> Watch Dog
101 * This setting enables or disables Watchdog function. When enabled, the
102 * default watchdog timer is set to be 5 minutes (about 4m35s). It is
103 * enough to load and run the OS. The application (service or driver) has
104 * to take over the control once OS is running up and before watchdog
110 * This jumper is used for safety. Closed is enabled. This jumper
111 * prevents user enables watchdog in BIOS by accident.
113 * To enable Watch Dog function, both BIOS and JUMPER must be enabled.
115 * The documentation lists motherboards P4SBx and P4DPx series as of
116 * 20-March-2002. However, this code works flawlessly with much newer
117 * motherboards, such as my X6DHR-8G2 (SuperServer 6014H-82).
119 * The original iTCO driver as written does not actually reset the
120 * watchdog timer on these machines, as a result they reboot after five
123 * NOTE: You may leave the Watchdog function disabled in the SuperMicro
124 * BIOS to avoid a "boot-race"... This driver will enable watchdog
125 * functionality even if it's disabled in the BIOS once the /dev/watchdog
130 #define SM_REGINDEX 0x2e /* SuperMicro ICH4+ Register Index */
131 #define SM_DATAIO 0x2f /* SuperMicro ICH4+ Register Data I/O */
133 /* Control Register's */
134 #define SM_CTLPAGESW 0x07 /* SuperMicro ICH4+ Control Page Switch */
135 #define SM_CTLPAGE 0x08 /* SuperMicro ICH4+ Control Page Num */
137 #define SM_WATCHENABLE 0x30 /* Watchdog enable: Bit 0: 0=off, 1=on */
139 #define SM_WATCHPAGE 0x87 /* Watchdog unlock control page */
141 #define SM_ENDWATCH 0xAA /* Watchdog lock control page */
143 #define SM_COUNTMODE 0xf5 /* Watchdog count mode select */
144 /* (Bit 3: 0 = seconds, 1 = minutes */
146 #define SM_WATCHTIMER 0xf6 /* 8-bits, Watchdog timer counter (RW) */
148 #define SM_RESETCONTROL 0xf7 /* Watchdog reset control */
149 /* Bit 6: timer is reset by kbd interrupt */
150 /* Bit 7: timer is reset by mouse interrupt */
152 static void supermicro_new_unlock_watchdog(void)
154 /* Write 0x87 to port 0x2e twice */
155 outb(SM_WATCHPAGE, SM_REGINDEX);
156 outb(SM_WATCHPAGE, SM_REGINDEX);
157 /* Switch to watchdog control page */
158 outb(SM_CTLPAGESW, SM_REGINDEX);
159 outb(SM_CTLPAGE, SM_DATAIO);
162 static void supermicro_new_lock_watchdog(void)
164 outb(SM_ENDWATCH, SM_REGINDEX);
167 static void supermicro_new_pre_start(unsigned int heartbeat)
171 supermicro_new_unlock_watchdog();
173 /* Watchdog timer setting needs to be in seconds*/
174 outb(SM_COUNTMODE, SM_REGINDEX);
175 val = inb(SM_DATAIO);
177 outb(val, SM_DATAIO);
179 /* Write heartbeat interval to WDOG */
180 outb(SM_WATCHTIMER, SM_REGINDEX);
181 outb((heartbeat & 255), SM_DATAIO);
183 /* Make sure keyboard/mouse interrupts don't interfere */
184 outb(SM_RESETCONTROL, SM_REGINDEX);
185 val = inb(SM_DATAIO);
187 outb(val, SM_DATAIO);
189 /* enable watchdog by setting bit 0 of Watchdog Enable to 1 */
190 outb(SM_WATCHENABLE, SM_REGINDEX);
191 val = inb(SM_DATAIO);
193 outb(val, SM_DATAIO);
195 supermicro_new_lock_watchdog();
198 static void supermicro_new_pre_stop(void)
202 supermicro_new_unlock_watchdog();
204 /* disable watchdog by setting bit 0 of Watchdog Enable to 0 */
205 outb(SM_WATCHENABLE, SM_REGINDEX);
206 val = inb(SM_DATAIO);
208 outb(val, SM_DATAIO);
210 supermicro_new_lock_watchdog();
213 static void supermicro_new_pre_set_heartbeat(unsigned int heartbeat)
215 supermicro_new_unlock_watchdog();
217 /* reset watchdog timeout to heartveat value */
218 outb(SM_WATCHTIMER, SM_REGINDEX);
219 outb((heartbeat & 255), SM_DATAIO);
221 supermicro_new_lock_watchdog();
225 * Generic Support Functions
228 void iTCO_vendor_pre_start(unsigned long acpibase,
229 unsigned int heartbeat)
231 if (vendorsupport == SUPERMICRO_NEW_BOARD)
232 supermicro_new_pre_start(heartbeat);
234 EXPORT_SYMBOL(iTCO_vendor_pre_start);
236 void iTCO_vendor_pre_stop(unsigned long acpibase)
238 if (vendorsupport == SUPERMICRO_NEW_BOARD)
239 supermicro_new_pre_stop();
241 EXPORT_SYMBOL(iTCO_vendor_pre_stop);
243 void iTCO_vendor_pre_keepalive(unsigned long acpibase, unsigned int heartbeat)
245 if (vendorsupport == SUPERMICRO_OLD_BOARD)
246 supermicro_old_pre_keepalive(acpibase);
247 else if (vendorsupport == SUPERMICRO_NEW_BOARD)
248 supermicro_new_pre_set_heartbeat(heartbeat);
250 EXPORT_SYMBOL(iTCO_vendor_pre_keepalive);
252 void iTCO_vendor_pre_set_heartbeat(unsigned int heartbeat)
254 if (vendorsupport == SUPERMICRO_NEW_BOARD)
255 supermicro_new_pre_set_heartbeat(heartbeat);
257 EXPORT_SYMBOL(iTCO_vendor_pre_set_heartbeat);
259 int iTCO_vendor_check_noreboot_on(void)
261 switch (vendorsupport) {
262 case SUPERMICRO_OLD_BOARD:
268 EXPORT_SYMBOL(iTCO_vendor_check_noreboot_on);
270 static int __init iTCO_vendor_init_module(void)
272 printk(KERN_INFO PFX "vendor-support=%d\n", vendorsupport);
276 static void __exit iTCO_vendor_exit_module(void)
278 printk(KERN_INFO PFX "Module Unloaded\n");
281 module_init(iTCO_vendor_init_module);
282 module_exit(iTCO_vendor_exit_module);
284 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>, R. Seretny <lkpatches@paypc.com>");
285 MODULE_DESCRIPTION("Intel TCO Vendor Specific WatchDog Timer Driver Support");
286 MODULE_VERSION(DRV_VERSION);
287 MODULE_LICENSE("GPL");